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linux/drivers/gpu
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Gajendra Uttamchand cb4afddf9e drm/xe/lrc: document sentinel and make CTX_TIMESTAMP read TOCTOU-safe 
Problem: CTX_TIMESTAMP MMIO reads could be stale if a context
switched out between check and read; LRC stores a sentinel while
a context starts that must not be treated as a real timestamp.

Fix: Check the LRC-stored sentinel before and after the MMIO read;
return the LRC value if the context switched out to avoid TOCTOU.

Note: Keep XE_LRC_CTX_TIMESTAMP_ACTIVE in xe_lrc.h as the
canonical sentinel.

Fixes: d243ef6a39 ("drm/xe/lrc: Refactor xe_lrc_timestamp to simplify logic")
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/work_items/7956
Assisted-by: GitHub-Copilot:claude-sonnet-5
Signed-off-by: Gajendra Uttamchand <gajendra.uttamchand@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Acked-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Link: https://patch.msgid.link/20260810071812.213358-4-gajendra.uttamchand@intel.com
(cherry picked from commit a806534474)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
History 2026-08-13 14:56:33 +02:00
..
drm drm/xe/lrc: document sentinel and make CTX_TIMESTAMP read TOCTOU-safe 2026-08-13 14:56:33 +02:00
host1x gpu: host1x: Fix use-after-free in host1x_bo_clear_cached_mappings 2026-07-16 20:26:28 +02:00
ipu-v3 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
nova-core drm-next for 7.2-rc1 2026-06-17 10:21:00 +01:00
tests gpu/tests/gpu_buddy: Add gpu_test_buddy_alloc_range for exact-range allocation 2026-03-09 13:58:12 +05:30
trace gpu/trace: make TRACE_GPU_MEM configurable 2025-07-08 09:34:47 -07:00
vga fbdev: Wrap fbcon updates from vga-switcheroo in helper 2026-06-09 16:00:11 +02:00
buddy.c gpu/buddy: bail out of try_harder when alignment cannot be honoured 2026-07-09 18:49:49 +05:30
Kconfig gpu: Move DRM buddy allocator one level up (part two) 2026-02-06 11:38:35 +10:00
Makefile gpu: Fix uninitialized buddy for built-in drivers 2026-02-24 13:40:59 +10:00